Grinding, milling and drilling are examples of operations where applications require simultaneous rotational and axial movement. For these operations, SKF developed an axially oscillating motorized spindle which allows speeds of up to 32,500 r/min (ndm = 2.1 x 106). With oscillating frequencies exceeding 10 Hz, fine positioning can be achieved with the spindle shaft alone and machine vibration is considerably reduced.
For high-speed milling of light alloys and ferrous materials, SKF developed a synchronous motor spindle, HIPRO, which offers a high level of running accuracy, minimal thermal elongation of the spindle and high permissible speeds.
